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Optronics LED Trailer Utility Light - Submersible - 10 Diodes - Round - Clear Lens

Optronics LED Trailer Utility Light - Submersible - 10 Diodes - Round - Clear Lens

Item # BUL43CB
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4-5/16" Diameter round. Waterproof, LED trailer utility light produces bright white light. Durable polycarbonate housing and lens. Recessed mount with grommet (sold separately). Accepts standard 2-prong plug. Lowest Prices for the best work lights from Optronics. Optronics LED Trailer Utility Light - Submersible - 10 Diodes - Round - Clear Lens part number BUL43CB can be ordered online at etrailer.com or call 800-298-1624 for expert service.
  • All Info
  • Reviews (17)
  • Q & A (6)
  • Photos
  • Why etrailer?

Optronics Work Lights - BUL43CB

  • LED Light
  • Recessed Mount
  • White
  • Exterior Lights
  • Interior Lights
  • Round
  • Utility Lights
  • Optronics

4-5/16" Diameter round. Waterproof, LED trailer utility light produces bright white light. Durable polycarbonate housing and lens. Recessed mount with grommet (sold separately). Accepts standard 2-prong plug.


  • LED trailer utility light produces bright white light
    • Not certified for backup light function
  • Sonically sealed, waterproof housing and lens unit is submersible
  • LEDs make great replacements for incandescent lights
    • Last 50 times longer
    • More efficient - provide brigther light with less power output
    • No bulbs to replace - no brittle filaments
  • Durable polycarbonate housing and lens
  • Clear lens over white LEDs
  • Compatible with 12V DC systems
  • Recessed mount to trailer with grommet (A45GB - sold separately)
  • Accepts industry standard 2-prong plug (A45CB or A49PB - sold separately)


  • Dimensions: 4-5/16" diameter x 1-15/16" thick
  • Diodes: 10
  • Power draw at 12.8V: 0.275 amps
  • Lifetime warranty on LEDs

Optronics BUL43 Series LED Utility Light

Sonically Sealed, Waterproof Trailer Light

The waterproof construction of this light makes it ideal for use on trailers that may be submerged, like a boat trailer. The housing and lens are sonically sealed together to create a single unit, which means that water will not get into the light and damage the diodes or circuit board.

BUL43CB Optronics LED Trailer Utility Light - Submersible - 10 Diodes - Round - Clear Lens

Alternate part number: BUL-43CB

California residents: click here

Customer Reviews

Optronics LED Trailer Utility Light - Submersible - 10 Diodes - Round - Clear Lens - BUL43CB

Average Customer Rating:  4.9 out of 5 stars   (17 Customer Reviews)

4-5/16" Diameter round. Waterproof, LED trailer utility light produces bright white light. Durable polycarbonate housing and lens. Recessed mount with grommet (sold separately). Accepts standard 2-prong plug.


I bought these led trailer lights to install in my service body as back up lights, and they have been awesome! They light up everything behind me while backing up at night.


This is my second order and so far everything is excellent.Replaced lights on Gulf Stream Class A diesel M/H.Outstanding!Replaced taillight s on jeep wrangler.Will be replacing lights on 18' open race trailer.

They are great.No problems well worth the cost.
Richard - 10/21/2014


Do to current weather conditions, I have not been able to change out the lights on my truck camper. Great customer service

The lights work as good as and better than I expected
mario g - 03/03/2019


This product has proved very durable to the environmental effects. They are used as ground lights for our fire apparatus and withstand the road grime they are subjected to, especially during the winter season.


etrailer will always be my go-to. Easy online ordering the customer service is first class. I wish more online retailers would have the same go to market attitude.


These lights are exactly as advertised. They were a perfect match to the non-led lights I was replacing. They provide an amazing amount of light and the install was simple. I would definitely purchase these lights again.


Great product couldn't find locally took a chance and what I got was outstanding. I installed them the next day and was on the road in 30 minutes. Very bright lights


Works great for our application, going on a truck for backup light. Hopefully will be nice and bright when installed. Customer service A+.


The light has performed very well for the application. The price is reasonable.


This is a really nice product! The simplicity of mounting along with the very low current draw opens up a ton of switching options.


Used these as backup lights on a stock trailer. Brighter than I expected!


We received our order as promised. The products were of good quality for a fair price. We will order again.


More light than what I was hoping for! Great


Work great look good


great, no problems


by: 02/11/2021


Ask the Experts about this Optronics Work Lights

  • Light Output of Optronics # BUL43CB Trailer Lights
    For the most part, Optronics uses Candela rather than Lumens to measure the output of their trailer lamps. The Optronics # BUL43CB light output is 310 Candela. At a distance of 1 foot, Candela is equal to Lumens. You might also need a pigtail, like # A47PB or a mounting grommet # A45GB.
    view full answer...
  • 4 Inch Round Trailer Tail Light Cutout Size
    The closest to 4 inch round lights we have is the Optronics LED Trailer Utility Light # BUL43CB or Trailer tail Light # STL55RB which are actually 4-5/16" diameter x 1-15/16" thick. These are designed to fit the Rubber Grommet for 4" Round Trailer Lights - PVC # A45GB which requires a 4-1/2 inch diameter cutout. You will also need wiring pigtail # A47PB. If you are interested in the Optronics Trailer Tail Light - Stop, Turn, Tail - Incandescent - Round - Red Lens # ST40RB you asked...
    view full answer...
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  • 4-1/4 Inch Round Clear LED Light Upgrade Lumen Rating
    The Peterson Trailer Tail Light - Weatherproof - Stop, Turn, Tail - Incandescent - Round - Red Lens # M426R is 4-1/4 inches diameter and using a grommet that fits the 4-1/2 inch hole. With this same grommet you can use the Peterson LumenX LED Trailer Tail Light - Weatherproof - 7 Diodes - Clear Lens # M826C-7 which has a 1200 lumen output. The GloLight LED Backup Light for Truck or Trailer - Submersible - 21 Diodes - Round - Clear - Qty 1 # BUL101CB has 326.4 lumens. The Optronics...
    view full answer...
  • 4-Inch Round White LED Work Light to Fit Rubber Grommet A45GB
    Optronics round light grommet # A45GB fits a 4-1/2-inch cutout and accepts a 4-inch round light such as # BUL43CB. This round white LED-type work light features 10 super diodes for bright high-efficiency lighting. This light is intended as a work light; it is not certified for use as a backup light. For a 2-wire pigtail lead you can use part # A45CB. Thanks to the high-efficiency of this LED light you can use multiple lights without causing the same power draw demanded by incandescent...
    view full answer...
  • Compatibility of High-Efficiency LED-Type Exterior Trailer Lighting
    An individual LED type light may not put out as much light as certain individual halogen lights do, but because, as you noted, LEDs use so little power you can use more of them. You could potentially BOTH increase your overall light output and still save power, leaving more of the generator's capacity to operate other devices. Another advantage of LED lighting is reduced waste heat (a result of the LEDs' efficiency). The linked page displays all LED type trailer utility lights. These...
    view full answer...
    Image 1 for
  • Replacement 4 Inch Reverse Lights to Replace Truck Lite Stop Turn Lights
    If the cut out diameter of your vehicle is 4-1/2 inches then you can install the part # STL55RB in place of what you have with the grommet part # A45GB. For a similar clear version of this light you would want the # BUL43CB.
    view full answer...
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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Laura H
Updated by:
Laura H
Employee Brian T
Updated by:
Brian T

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